Time II Clock Card

[David_M]

I'm looking for a schematic for a Time II Clock Card.

I have one here that kind of works. It was in really bad shape due to poor storage and a leaking battery.
I also suspect that the copper on the pcb was not cleaned before tinning during manufacture. Every joint I desoldered went back to oxidised cooper, with no trace of solder on the pads.

I had to desolder every component, sand the oxidation and correctly tin the pcb. Corroded components were replaced and new sockets fitted along with a new battery fitted. Each of the IC's was tested before being socketed.
The next problem was missing and broken tracks due to both the leaky battery and poor tinning and storage. It seems I found and fixed some of them but apparently not all.

So at this stage I assume there are no faulty components or sockets.
Any register read from the RTC reads between 12 and 15, so I believe D2 and D3 have broken tracks somewhere. There may also be other issues so to save some effort a schematic would be great

Edit: After careful thought I've decided to desolder and remove the rechargable battery I fitted. Thinking about the future of this card, it will likely get little real use so at best case the battery will drain to the point the battery is damaged and worst case it will leak again eventually. Instead I've fitted a button cell holder and a diode to keep it from being charged when the machine is powered up. I've used a schottky barrier diode, because they have a lower forward voltage drop and will gain .3v in battery usability over a silicon diode.

 

[David_M]

Just an update, I've managed to get the card working as suspected there were more broken tracks in the D2 and D3 lines.
Due to the pcb damage its ugly but it works. A few hours in it too but I don't see an RTC card often for its worth the effort.

I am still keen to get a schematic and any disks it might originally have come with.

 

[Druid6900]

David,

I looked around in my schematic collect (I assume you've scoured the 'net) and I have nothing on it but the user manual and it has no schematics.

 

[KC9UDX]

There's a good looking one for sale here very locally. If I had the cash I'd probably pick it up.

 

[David_M]

Given the strange manner the address the clock its a good thing I found the manual online, I'd have never guessed at the strange way to access it.

The final count was 9 broken tracks or plate throughs, I did by best to reduce the ugly... I used green kynar wire in an attempt to make in less noticeable.